Accepts the transaction into mined blocks at a higher (or lower) priority

Arguments

1. "txid"

string

required

The transaction id.

2. dummy

numeric

optional

API-Compatibility for previous API. Must be zero or null.
DEPRECATED. For forward compatibility use named arguments and omit this parameter.

3. fee_delta

numeric

required

The fee value (in satoshis) to add (or subtract, if negative).
Note, that this value is not a fee rate. It is a value to modify absolute fee of the TX.
The fee is not actually paid, only the algorithm for selecting transactions into a block
considers the transaction as it would have paid a higher (or lower) fee.